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/* creates a gaussian filter.
*
* 02/01/14
* - from gaussian.c
*/
/*
This file is part of VIPS.
VIPS is free software; you can redistribute it and/or modify
it under the terms of the GNU Lesser General Public License as published by
the Free Software Foundation; either version 2 of the License, or
(at your option) any later version.
This program is distributed in the hope that it will be useful,
but WITHOUT ANY WARRANTY; without even the implied warranty of
MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
GNU Lesser General Public License for more details.
You should have received a copy of the GNU Lesser General Public License
along with this program; if not, write to the Free Software
Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
02110-1301 USA
*/
/*
These files are distributed with VIPS - http://www.vips.ecs.soton.ac.uk
*/
/*
#define VIPS_DEBUG
*/
#ifdef HAVE_CONFIG_H
#include <config.h>
#endif /*HAVE_CONFIG_H*/
#include <glib/gi18n-lib.h>
#include <stdio.h>
#include <string.h>
#include <stdlib.h>
#include <math.h>
#include <vips/vips.h>
#include "pcreate.h"
#include "point.h"
#include "pmask.h"
G_DEFINE_TYPE( VipsMaskGaussian, vips_mask_gaussian, VIPS_TYPE_MASK );
static double
vips_mask_gaussian_point( VipsMask *mask, double dx, double dy )
{
VipsMaskGaussian *gaussian = (VipsMaskGaussian *) mask;
double fc = gaussian->frequency_cutoff;
double ac = gaussian->amplitude_cutoff;
double cnst = log( ac );
double fc2 = fc * fc;
double dist2 = (dx * dx + dy * dy) / fc2;
return( 1.0 - exp( cnst * dist2 ) );
}
static void
vips_mask_gaussian_class_init( VipsMaskGaussianClass *class )
{
GObjectClass *gobject_class = G_OBJECT_CLASS( class );
VipsObjectClass *vobject_class = VIPS_OBJECT_CLASS( class );
VipsMaskClass *mask_class = VIPS_MASK_CLASS( class );
gobject_class->set_property = vips_object_set_property;
gobject_class->get_property = vips_object_get_property;
vobject_class->nickname = "mask_gaussian";
vobject_class->description = _( "make a gaussian filter" );
mask_class->point = vips_mask_gaussian_point;
VIPS_ARG_DOUBLE( class, "frequency_cutoff", 7,
_( "Frequency cutoff" ),
_( "Frequency cutoff" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsMaskGaussian, frequency_cutoff ),
0.0, 1000000.0, 0.5 );
VIPS_ARG_DOUBLE( class, "amplitude_cutoff", 8,
_( "Amplitude cutoff" ),
_( "Amplitude cutoff" ),
VIPS_ARGUMENT_REQUIRED_INPUT,
G_STRUCT_OFFSET( VipsMaskGaussian, amplitude_cutoff ),
0.0, 1.0, 0.5 );
}
static void
vips_mask_gaussian_init( VipsMaskGaussian *gaussian )
{
gaussian->frequency_cutoff = 0.5;
gaussian->amplitude_cutoff = 0.5;
}
/**
* vips_mask_gaussian:
* @out: (out): output image
* @width: image size
* @height: image size
* @frequency_cutoff: frequency threshold
* @amplitude_cutoff: amplitude threshold
* @...: %NULL-terminated list of optional named arguments
*
* Optional arguments:
*
* * @nodc: don't set the DC pixel
* * @reject: invert the filter sense
* * @optical: coordinates in optical space
* * @uchar: output a uchar image
*
* Make a gaussian high- or low-pass filter, that is, one with a variable,
* smooth transition positioned at @frequency_cutoff.
*
* See also: vips_mask_ideal().
*
* Returns: 0 on success, -1 on error
*/
int
vips_mask_gaussian( VipsImage **out, int width, int height,
double frequency_cutoff, double amplitude_cutoff, ... )
{
va_list ap;
int result;
va_start( ap, amplitude_cutoff );
result = vips_call_split( "mask_gaussian", ap, out, width, height,
frequency_cutoff, amplitude_cutoff );
va_end( ap );
return( result );
}
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